//@ts-nocheck
import { base64 } from "./Base64"
import { ieee754 } from "./iee754"

// const ieee754 = require('ieee754')
const customInspectSymbol =
    (typeof Symbol === 'function' && typeof Symbol['for'] === 'function') // eslint-disable-line dot-notation
        ? Symbol['for']('nodejs.util.inspect.custom') // eslint-disable-line dot-notation
        : null



export class Buffer {
    length: any
    _arr: this
    /*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
    /* eslint-disable no-proto */

    constructor(str: string, encoding?: string);
    constructor(size: number);
    constructor(array: Uint8Array);
    constructor(arrayBuffer: ArrayBuffer);
    constructor(array: any[]);
    constructor(buffer: Buffer);

    constructor(arg, encodingOrOffset?, length?) {
        // Common case.
        if (typeof arg === 'number') {
            if (typeof encodingOrOffset === 'string') {
                throw new TypeError(
                    'The "string" argument must be of type string. Received type number'
                )
            }
            return allocUnsafe(arg) as any

        }
        return from(arg, encodingOrOffset, length) as any
    }


    /**
     * If `Buffer.TYPED_ARRAY_SUPPORT`:
     *   === true    Use Uint8Array implementation (fastest)
     *   === false   Print warning and recommend using `buffer` v4.x which has an Object
     *               implementation (most compatible, even IE6)
     *
     * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
     * Opera 11.6+, iOS 4.2+.
     *
     * We report that the browser does not support typed arrays if the are not subclassable
     * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
     * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
     * for __proto__ and has a buggy typed array implementation.
     */
    public static TYPED_ARRAY_SUPPORT() {
        // Can typed array instances can be augmented?
        try {
            const arr = new Uint8Array(1)
            const proto = { foo: function () { return 42 } }

            Object.setPrototypeOf(proto, Uint8Array.prototype)

            Object.setPrototypeOf(arr, proto)

            return arr.foo() === 42
        } catch (e) {
            return false
        }
    }

    static poolSize = 8192 // not used by this implementation


    static from(array: any[]): Uint8Array;
    static from(arrayBuffer: ArrayBuffer, byteOffset?: number, length?: number): Uint8Array;
    static from(buffer: Buffer | Uint8Array): Uint8Array;
    static from(str: string, encoding?: string): Uint8Array;
    /**
     * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
     * if value is a number.
     * Buffer.from(str[, encoding])
     * Buffer.from(array)
     * Buffer.from(buffer)
     * Buffer.from(arrayBuffer[, byteOffset[, length]])
     **/
    static from(value, encodingOrOffset?, length?) {
        return from(value, encodingOrOffset, length)
    }



    /**
     * Creates a new filled Buffer instance.
     * alloc(size[, fill[, encoding]])
     **/

    static alloc(size: number, fill?: string | Buffer | number, encoding?: string): Buffer;
    static alloc(size, fill, encoding) {
        return alloc(size, fill, encoding)
    }



    /**
     * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
     * */

    static allocUnsafe(size: number): Buffer;
    static allocUnsafe(size) {
        return allocUnsafe(size)
    }
    /**
     * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
     */

    static allocUnsafeSlow(size: number): Buffer;
    static allocUnsafeSlow(size) {
        return allocUnsafe(size)
    }


    static isBuffer(obj: any): boolean;
    static isBuffer(b) {
        return b != null && b._isBuffer === true &&
            b !== Buffer.prototype // so Buffer.isBuffer(Buffer.prototype) will be false
    }


    static compare(buf1: Uint8Array, buf2: Uint8Array): number;
    static compare(a, b) {
        if (isInstance(a, Uint8Array)) a = Buffer.from(a, a.offset, a.byteLength)
        if (isInstance(b, Uint8Array)) b = Buffer.from(b, b.offset, b.byteLength)
        if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
            throw new TypeError(
                'The "buf1", "buf2" arguments must be one of type Buffer or Uint8Array'
            )
        }

        if (a === b) return 0

        let x = a.length
        let y = b.length

        for (let i = 0, len = Math.min(x, y); i < len; ++i) {
            if (a[i] !== b[i]) {
                x = a[i]
                y = b[i]
                break
            }
        }

        if (x < y) return -1
        if (y < x) return 1
        return 0
    }

    static isEncoding(encoding: string): boolean;
    static isEncoding(encoding) {
        switch (String(encoding).toLowerCase()) {
            case 'hex':
            case 'utf8':
            case 'utf-8':
            case 'ascii':
            case 'latin1':
            case 'binary':
            case 'base64':
            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return true
            default:
                return false
        }
    }

    static byteLength(string: string, encoding?: string): number;
    static byteLength(string, encoding) {
        if (Buffer.isBuffer(string)) {
            return string.length
        }
        if (ArrayBuffer.isView(string) || isInstance(string, ArrayBuffer)) {
            return string.byteLength
        }
        if (typeof string !== 'string') {
            throw new TypeError(
                'The "string" argument must be one of type string, Buffer, or ArrayBuffer. ' +
                'Received type ' + typeof string
            )
        }

        const len = string.length
        const mustMatch = (arguments.length > 2 && arguments[2] === true)
        if (!mustMatch && len === 0) return 0

        // Use a for loop to avoid recursion
        let loweredCase = false
        for (; ;) {
            switch (encoding) {
                case 'ascii':
                case 'latin1':
                case 'binary':
                    return len
                case 'utf8':
                case 'utf-8':
                    return utf8ToBytes(string).length
                case 'ucs2':
                case 'ucs-2':
                case 'utf16le':
                case 'utf-16le':
                    return len * 2
                case 'hex':
                    return len >>> 1
                case 'base64':
                    return base64ToBytes(string).length
                default:
                    if (loweredCase) {
                        return mustMatch ? -1 : utf8ToBytes(string).length // assume utf8
                    }
                    encoding = ('' + encoding).toLowerCase()
                    loweredCase = true
            }
        }
    }


    static concat(list: Uint8Array[], totalLength?: number): Uint8Array;
    static concat(list, length) {
        if (!Array.isArray(list)) {
            throw new TypeError('"list" argument must be an Array of Buffers')
        }

        if (list.length === 0) {

            return Buffer.alloc(0)
        }

        let i
        if (length === undefined) {
            length = 0
            for (i = 0; i < list.length; ++i) {
                length += list[i].length
            }
        }

        const buffer = Buffer.allocUnsafe(length)
        let pos = 0
        for (i = 0; i < list.length; ++i) {
            let buf = list[i]
            if (isInstance(buf, Uint8Array)) {
                if (pos + buf.length > buffer.length) {
                    if (!Buffer.isBuffer(buf)) {
                        buf = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength)
                    }
                    buf.copy(buffer, pos)
                } else {
                    Uint8Array.prototype.set.call(
                        buffer,
                        buf,
                        pos
                    )
                }
            } else if (!Buffer.isBuffer(buf)) {
                throw new TypeError('"list" argument must be an Array of Buffers')
            } else {
                buf.copy(buffer, pos)
            }
            pos += buf.length
        }
        return buffer
    }


    swap16(): Uint8Array;
    swap16() {
        const len = this.length
        if (len % 2 !== 0) {
            throw new RangeError('Buffer size must be a multiple of 16-bits')
        }
        for (let i = 0; i < len; i += 2) {
            swap(this, i, i + 1)
        }
        return this as any
    }

    swap32(): Uint8Array;
    swap32() {
        const len = this.length
        if (len % 4 !== 0) {
            throw new RangeError('Buffer size must be a multiple of 32-bits')
        }
        for (let i = 0; i < len; i += 4) {
            swap(this, i, i + 3)
            swap(this, i + 1, i + 2)
        }
        return this as any
    }

    swap64(): Uint8Array;
    swap64() {
        const len = this.length
        if (len % 8 !== 0) {
            throw new RangeError('Buffer size must be a multiple of 64-bits')
        }
        for (let i = 0; i < len; i += 8) {
            swap(this, i, i + 7)
            swap(this, i + 1, i + 6)
            swap(this, i + 2, i + 5)
            swap(this, i + 3, i + 4)
        }
        return this as any
    }

    toString(encoding?: string, start?: number, end?: number)
    toString(...args: any[]) {
        const length = this.length
        if (length === 0) return ''
        if (arguments.length === 0) return utf8Slice(this, 0, length)
        return slowToString.apply(this, arguments)
    }

    equals(otherBuffer: Uint8Array): boolean
    equals(b) {
        if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
        if (this === b) return true

        return Buffer.compare(this, b) === 0
    }

    inspect() {
        let str = ''
        const max = INSPECT_MAX_BYTES
        str = this.toString('hex', 0, max).replace(/(.{2})/g, '$1 ').trim()
        if (this.length > max) str += ' ... '
        return '<Buffer ' + str + '>'
    }

    compare(otherBuffer: Uint8Array, targetStart?: number, targetEnd?: number, sourceStart?: number, sourceEnd?: number): number;
    compare(target, start, end, thisStart, thisEnd) {
        if (isInstance(target, Uint8Array)) {
            target = Buffer.from(target, target.offset, target.byteLength)
        }
        if (!Buffer.isBuffer(target)) {
            throw new TypeError(
                'The "target" argument must be one of type Buffer or Uint8Array. ' +
                'Received type ' + (typeof target)
            )
        }

        if (start === undefined) {
            start = 0
        }
        if (end === undefined) {
            end = target ? target.length : 0
        }
        if (thisStart === undefined) {
            thisStart = 0
        }
        if (thisEnd === undefined) {
            thisEnd = this.length
        }

        if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
            throw new RangeError('out of range index')
        }

        if (thisStart >= thisEnd && start >= end) {
            return 0
        }
        if (thisStart >= thisEnd) {
            return -1
        }
        if (start >= end) {
            return 1
        }

        start >>>= 0
        end >>>= 0
        thisStart >>>= 0
        thisEnd >>>= 0

        if (this === target) return 0

        let x = thisEnd - thisStart
        let y = end - start
        const len = Math.min(x, y)

        const thisCopy = this.slice(thisStart, thisEnd)
        const targetCopy = target.slice(start, end)

        for (let i = 0; i < len; ++i) {
            if (thisCopy[i] !== targetCopy[i]) {
                x = thisCopy[i]
                y = targetCopy[i]
                break
            }
        }

        if (x < y) return -1
        if (y < x) return 1
        return 0
    }

    includes(value: string | number | Uint8Array, byteOffset?: number, encoding?: string): boolean;
    includes(val, byteOffset, encoding) {
        return this.indexOf(val, byteOffset, encoding) !== -1
    }

    indexOf(value: string | number | Uint8Array, byteOffset?: number, encoding?: string): number;
    indexOf(val, byteOffset, encoding) {
        return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
    }

    lastIndexOf(value: string | number | Uint8Array, byteOffset?: number, encoding?: string): number;
    lastIndexOf(val, byteOffset, encoding) {
        return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
    }


    write(string: string, offset?: number, length?: number, encoding?: string): number;
    write(string: string, offset: number, length: number, encoding: string) {
        // Buffer#write(string)
        let tmp: number = 0
        if (offset === undefined) {
            encoding = 'utf8'
            length = this.length
            offset = 0
            // Buffer#write(string, encoding)
        } else if (length === undefined && typeof offset === 'string') {
            encoding = offset
            length = this.length
            offset = 0
            // Buffer#write(string, offset[, length][, encoding])
        } else if (isFinite(offset)) {
            offset = offset >>> 0
            if (isFinite(length)) {
                length = length >>> 0
                if (encoding === undefined) encoding = 'utf8'
            } else {
                tmp = length
                length = undefined
            }
        } else {
            throw new Error(
                'Buffer.write(string, encoding, offset[, length]) is no longer supported'
            )
        }

        const remaining = this.length - offset
        if (length === undefined || length > remaining) length = remaining

        if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
            throw new RangeError('Attempt to write outside buffer bounds')
        }

        if (!tmp) encoding = 'utf8'

        let loweredCase = false
        for (; ;) {
            switch (encoding) {
                case 'hex':
                    return hexWrite(this, string, offset, length)

                case 'utf8':
                case 'utf-8':
                    return utf8Write(this, string, offset, length)

                case 'ascii':
                case 'latin1':
                case 'binary':
                    return asciiWrite(this, string, offset, length)

                case 'base64':
                    // Warning: maxLength not taken into account in base64Write
                    return base64Write(this, string, offset, length)

                case 'ucs2':
                case 'ucs-2':
                case 'utf16le':
                case 'utf-16le':
                    return ucs2Write(this, string, offset, length)

                default:
                    if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                    encoding = ('' + encoding).toLowerCase()
                    loweredCase = true
            }
        }
    }

    toJSON(): { type: 'Buffer', data: any[] };
    toJSON() {
        return {
            type: 'Buffer',
            data: Array.prototype.slice.call(this._arr || this, 0)
        }
    }

    slice(start?: number, end?: number): Uint8Array;
    slice(start, end) {
        const len = this.length
        start = ~~start
        end = end === undefined ? len : ~~end

        if (start < 0) {
            start += len
            if (start < 0) start = 0
        } else if (start > len) {
            start = len
        }

        if (end < 0) {
            end += len
            if (end < 0) end = 0
        } else if (end > len) {
            end = len
        }

        if (end < start) end = start

        const newBuf = this.subarray(start, end)
        // Return an augmented `Uint8Array` instance

        Object.setPrototypeOf(newBuf, Buffer.prototype)

        return newBuf
    }


    readUInt32LE(offset: number, noAssert?: boolean): number;
    readUInt32LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return ((this[offset]) |
            (this[offset + 1] << 8) |
            (this[offset + 2] << 16)) +
            (this[offset + 3] * 0x1000000)
    }

    readUInt32BE(offset: number, noAssert?: boolean): number;
    readUInt32BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return (this[offset] * 0x1000000) +
            ((this[offset + 1] << 16) |
                (this[offset + 2] << 8) |
                this[offset + 3])
    }


    readBigUInt64LE(offset: number): BigInt;
    readBigUInt64LE(offset) {
        if (defineBigIntMethod()) { return }
        offset = offset >>> 0
        validateNumber(offset, 'offset')
        const first = this[offset]
        const last = this[offset + 7]
        if (first === undefined || last === undefined) {
            boundsError(offset, this.length - 8)
        }

        const lo = first +
            this[++offset] * 2 ** 8 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 24

        const hi = this[++offset] +
            this[++offset] * 2 ** 8 +
            this[++offset] * 2 ** 16 +
            last * 2 ** 24

        return BigInt(lo) + (BigInt(hi) << BigInt(32))
    }


    readBigUInt64BE(offset: number): BigInt;
    readBigUInt64BE(offset) {
        if (defineBigIntMethod()) { return }

        offset = offset >>> 0
        validateNumber(offset, 'offset')
        const first = this[offset]
        const last = this[offset + 7]
        if (first === undefined || last === undefined) {
            boundsError(offset, this.length - 8)
        }

        const hi = first * 2 ** 24 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 8 +
            this[++offset]

        const lo = this[++offset] * 2 ** 24 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 8 +
            last

        return (BigInt(hi) << BigInt(32)) + BigInt(lo)
    }


    writeBigUInt64LE(value: number, offset: number): BigInt;
    writeBigUInt64LE(value, offset = 0) {
        if (defineBigIntMethod()) { return }

        return wrtBigUInt64LE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
    }


    writeBigUInt64BE(value: number, offset: number): BigInt;
    writeBigUInt64BE(value, offset = 0) {
        if (defineBigIntMethod()) { return }

        return wrtBigUInt64BE(this, value, offset, BigInt(0), BigInt('0xffffffffffffffff'))
    }

    readInt8(offset: number, noAssert?: boolean): number;
    readInt8(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 1, this.length)
        if (!(this[offset] & 0x80)) return (this[offset])
        return ((0xff - this[offset] + 1) * -1)
    }

    readInt16LE(offset: number, noAssert?: boolean): number;
    readInt16LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        const val = this[offset] | (this[offset + 1] << 8)
        return (val & 0x8000) ? val | 0xFFFF0000 : val
    }

    readInt16BE(offset: number, noAssert?: boolean): number;
    readInt16BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        const val = this[offset + 1] | (this[offset] << 8)
        return (val & 0x8000) ? val | 0xFFFF0000 : val
    }

    readInt32LE(offset: number, noAssert?: boolean): number;
    readInt32LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return (this[offset]) |
            (this[offset + 1] << 8) |
            (this[offset + 2] << 16) |
            (this[offset + 3] << 24)
    }

    readInt32BE(offset: number, noAssert?: boolean): number;
    readInt32BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)

        return (this[offset] << 24) |
            (this[offset + 1] << 16) |
            (this[offset + 2] << 8) |
            (this[offset + 3])
    }

    readBigInt64LE(offset: number): BigInt;
    readBigInt64LE(offset) {
        if (defineBigIntMethod()) { return }
        offset = offset >>> 0
        validateNumber(offset, 'offset')
        const first = this[offset]
        const last = this[offset + 7]
        if (first === undefined || last === undefined) {
            boundsError(offset, this.length - 8)
        }

        const val = this[offset + 4] +
            this[offset + 5] * 2 ** 8 +
            this[offset + 6] * 2 ** 16 +
            (last << 24) // Overflow


        return (BigInt(val) << BigInt(32)) + BigInt(first +
            this[++offset] * 2 ** 8 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 24)
    }


    readBigInt64BE(offset: number): BigInt;
    readBigInt64BE(offset) {
        if (defineBigIntMethod()) { return }
        offset = offset >>> 0
        validateNumber(offset, 'offset')
        const first = this[offset]
        const last = this[offset + 7]
        if (first === undefined || last === undefined) {
            boundsError(offset, this.length - 8)
        }

        const val = (first << 24) + // Overflow
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 8 +
            this[++offset]


        return (BigInt(val) << BigInt(32)) + BigInt(this[++offset] * 2 ** 24 +
            this[++offset] * 2 ** 16 +
            this[++offset] * 2 ** 8 +
            last)
    }

    readFloatLE(offset: number, noAssert?: boolean): number;
    readFloatLE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)
        return ieee754.read(this, offset, true, 23, 4)
    }

    readFloatBE(offset: number, noAssert?: boolean): number;
    readFloatBE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 4, this.length)
        return ieee754.read(this, offset, false, 23, 4)
    }

    readDoubleLE(offset: number, noAssert?: boolean): number;
    readDoubleLE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 8, this.length)
        return ieee754.read(this, offset, true, 52, 8)
    }

    readDoubleBE(offset: number, noAssert?: boolean): number;
    readDoubleBE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 8, this.length)
        return ieee754.read(this, offset, false, 52, 8)
    }

    readUIntLE(offset: number, byteLength: number, noAssert?: boolean): number;
    readUIntLE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) checkOffset(offset, byteLength, this.length)

        let val = this[offset]
        let mul = 1
        let i = 0
        while (++i < byteLength && (mul *= 0x100)) {
            val += this[offset + i] * mul
        }

        return val
    }

    writeUIntLE(value: number, offset: number, byteLength: number, noAssert?: boolean): number;
    writeUIntLE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            const maxBytes = Math.pow(2, 8 * byteLength) - 1
            checkInt(this, value, offset, byteLength, maxBytes, 0)
        }

        let mul = 1
        let i = 0
        this[offset] = value & 0xFF
        while (++i < byteLength && (mul *= 0x100)) {
            this[offset + i] = (value / mul) & 0xFF
        }

        return offset + byteLength
    }

    readUIntBE(offset: number, byteLength: number, noAssert?: boolean): number;
    readUIntBE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            checkOffset(offset, byteLength, this.length)
        }

        let val = this[offset + --byteLength]
        let mul = 1
        while (byteLength > 0 && (mul *= 0x100)) {
            val += this[offset + --byteLength] * mul
        }

        return val
    }

    writeUIntBE(value: number, offset: number, byteLength: number, noAssert?: boolean): number;
    writeUIntBE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) {
            const maxBytes = Math.pow(2, 8 * byteLength) - 1
            checkInt(this, value, offset, byteLength, maxBytes, 0)
        }

        let i = byteLength - 1
        let mul = 1
        this[offset + i] = value & 0xFF
        while (--i >= 0 && (mul *= 0x100)) {
            this[offset + i] = (value / mul) & 0xFF
        }

        return offset + byteLength
    }

    readIntLE(offset: number, byteLength: number, noAssert?: boolean): number;
    readIntLE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) checkOffset(offset, byteLength, this.length)

        let val = this[offset]
        let mul = 1
        let i = 0
        while (++i < byteLength && (mul *= 0x100)) {
            val += this[offset + i] * mul
        }
        mul *= 0x80

        if (val >= mul) val -= Math.pow(2, 8 * byteLength)

        return val
    }


    writeIntLE(value: number, offset: number, byteLength: number, noAssert?: boolean): number;
    writeIntLE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) {
            const limit = Math.pow(2, (8 * byteLength) - 1)

            checkInt(this, value, offset, byteLength, limit - 1, -limit)
        }

        let i = 0
        let mul = 1
        let sub = 0
        this[offset] = value & 0xFF
        while (++i < byteLength && (mul *= 0x100)) {
            if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
                sub = 1
            }
            this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
        }

        return offset + byteLength
    }

    readIntBE(offset: number, byteLength: number, noAssert?: boolean): number;
    readIntBE(offset, byteLength, noAssert) {
        offset = offset >>> 0
        byteLength = byteLength >>> 0
        if (!noAssert) checkOffset(offset, byteLength, this.length)

        let i = byteLength
        let mul = 1
        let val = this[offset + --i]
        while (i > 0 && (mul *= 0x100)) {
            val += this[offset + --i] * mul
        }
        mul *= 0x80

        if (val >= mul) val -= Math.pow(2, 8 * byteLength)

        return val
    }

    writeIntBE(value: number, offset: number, byteLength: number, noAssert?: boolean): number;
    writeIntBE(value, offset, byteLength, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) {
            const limit = Math.pow(2, (8 * byteLength) - 1)

            checkInt(this, value, offset, byteLength, limit - 1, -limit)
        }

        let i = byteLength - 1
        let mul = 1
        let sub = 0
        this[offset + i] = value & 0xFF
        while (--i >= 0 && (mul *= 0x100)) {
            if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
                sub = 1
            }
            this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
        }

        return offset + byteLength
    }

    readUInt8(offset: number, noAssert?: boolean): number;
    readUInt8(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 1, this.length)
        return this[offset]
    }

    writeUInt8(value: number, offset: number, noAssert?: boolean): number;
    writeUInt8(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
        this[offset] = (value & 0xff)
        return offset + 1
    }

    readUInt16LE(offset: number, noAssert?: boolean): number;
    readUInt16LE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        return this[offset] | (this[offset + 1] << 8)
    }

    writeUInt16LE(value: number, offset: number, noAssert?: boolean): number;
    writeUInt16LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
        return offset + 2
    }

    readUInt16BE(offset: number, noAssert?: boolean): number;
    readUInt16BE(offset, noAssert) {
        offset = offset >>> 0
        if (!noAssert) checkOffset(offset, 2, this.length)
        return (this[offset] << 8) | this[offset + 1]
    }

    writeUInt16BE(value: number, offset: number, noAssert?: boolean): number;
    writeUInt16BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
        this[offset] = (value >>> 8)
        this[offset + 1] = (value & 0xff)
        return offset + 2
    }

    writeUInt32LE(value: number, offset: number, noAssert?: boolean): number;
    writeUInt32LE(value, offset, noAssert?) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
        this[offset + 3] = (value >>> 24)
        this[offset + 2] = (value >>> 16)
        this[offset + 1] = (value >>> 8)
        this[offset] = (value & 0xff)
        return offset + 4
    }

    writeUInt32BE(value: number, offset: number, noAssert?: boolean): number;
    writeUInt32BE(value, offset, noAssert?) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
        this[offset] = (value >>> 24)
        this[offset + 1] = (value >>> 16)
        this[offset + 2] = (value >>> 8)
        this[offset + 3] = (value & 0xff)
        return offset + 4
    }

    writeInt8(value: number, offset: number, noAssert?: boolean): number;
    writeInt8(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
        if (value < 0) value = 0xff + value + 1
        this[offset] = (value & 0xff)
        return offset + 1
    }

    writeInt16LE(value: number, offset: number, noAssert?: boolean): number;
    writeInt16LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
        return offset + 2
    }

    writeInt16BE(value: number, offset: number, noAssert?: boolean): number;
    writeInt16BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
        this[offset] = (value >>> 8)
        this[offset + 1] = (value & 0xff)
        return offset + 2
    }

    writeInt32LE(value: number, offset: number, noAssert?: boolean): number;
    writeInt32LE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
        this[offset] = (value & 0xff)
        this[offset + 1] = (value >>> 8)
        this[offset + 2] = (value >>> 16)
        this[offset + 3] = (value >>> 24)
        return offset + 4
    }

    writeInt32BE(value: number, offset: number, noAssert?: boolean): number;
    writeInt32BE(value, offset, noAssert) {
        value = +value
        offset = offset >>> 0
        if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
        if (value < 0) value = 0xffffffff + value + 1
        this[offset] = (value >>> 24)
        this[offset + 1] = (value >>> 16)
        this[offset + 2] = (value >>> 8)
        this[offset + 3] = (value & 0xff)
        return offset + 4
    }


    writeBigInt64LE(value: number, offset: number): BigInt;
    writeBigInt64LE(value, offset = 0) {
        if (defineBigIntMethod()) { return }

        return wrtBigUInt64LE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
    }


    writeBigInt64BE(value: number, offset: number): BigInt;
    writeBigInt64BE(value, offset = 0) {
        if (defineBigIntMethod()) { return }

        return wrtBigUInt64BE(this, value, offset, -BigInt('0x8000000000000000'), BigInt('0x7fffffffffffffff'))
    }


    writeFloatLE(value: number, offset: number, noAssert?: boolean): number;
    writeFloatLE(value, offset, noAssert) {
        return writeFloat(this, value, offset, true, noAssert)
    }

    writeFloatBE(value: number, offset: number, noAssert?: boolean): number;
    writeFloatBE(value, offset, noAssert) {
        return writeFloat(this, value, offset, false, noAssert)
    }

    writeDoubleLE(value: number, offset: number, noAssert?: boolean): number;
    writeDoubleLE(value, offset, noAssert) {
        return writeDouble(this, value, offset, true, noAssert)
    }

    writeDoubleBE(value: number, offset: number, noAssert?: boolean): number;
    writeDoubleBE(value, offset, noAssert) {
        return writeDouble(this, value, offset, false, noAssert)
    }

    copy(targetBuffer: Uint8Array, targetStart?: number, sourceStart?: number, sourceEnd?: number): number;
    copy(target, targetStart, start, end) {
        if (!Buffer.isBuffer(target)) throw new TypeError('argument should be a Buffer')
        if (!start) start = 0
        if (!end && end !== 0) end = this.length
        if (targetStart >= target.length) targetStart = target.length
        if (!targetStart) targetStart = 0
        if (end > 0 && end < start) end = start

        // Copy 0 bytes; we're done
        if (end === start) return 0
        if (target.length === 0 || this.length === 0) return 0

        // Fatal error conditions
        if (targetStart < 0) {
            throw new RangeError('targetStart out of bounds')
        }
        if (start < 0 || start >= this.length) throw new RangeError('Index out of range')
        if (end < 0) throw new RangeError('sourceEnd out of bounds')

        // Are we oob?
        if (end > this.length) end = this.length
        if (target.length - targetStart < end - start) {
            end = target.length - targetStart + start
        }

        const len = end - start

        Uint8Array.prototype.set.call(
            target,

            this.subarray(start, end),
            targetStart
        )

        return len
    }

    // Usage:
    //    buffer.fill(number[, offset[, end]])
    //    buffer.fill(buffer[, offset[, end]])
    //    buffer.fill(string[, offset[, end]][, encoding])
    fill(value: any, offset?: number, end?: number, encoding?: string): this;
    fill(val, start, end, encoding) {
        // Handle string cases:
        if (typeof val === 'string') {
            if (typeof start === 'string') {
                encoding = start
                start = 0
                end = this.length
            } else if (typeof end === 'string') {
                encoding = end
                end = this.length
            }
            if (encoding !== undefined && typeof encoding !== 'string') {
                throw new TypeError('encoding must be a string')
            }
            if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
                throw new TypeError('Unknown encoding: ' + encoding)
            }
            if (val.length === 1) {
                const code = val.charCodeAt(0)
                if ((encoding === 'utf8' && code < 128) ||
                    encoding === 'latin1') {
                    // Fast path: If `val` fits into a single byte, use that numeric value.
                    val = code
                }
            }
        } else if (typeof val === 'number') {
            val = val & 255
        } else if (typeof val === 'boolean') {
            val = Number(val)
        }

        // Invalid ranges are not set to a default, so can range check early.
        if (start < 0 || this.length < start || this.length < end) {
            throw new RangeError('Out of range index')
        }

        if (end <= start) {
            return this
        }

        start = start >>> 0
        end = end === undefined ? this.length : end >>> 0

        if (!val) val = 0

        let i
        if (typeof val === 'number') {
            for (i = start; i < end; ++i) {
                this[i] = val
            }
        } else {
            const bytes = Buffer.isBuffer(val)
                ? val
                : Buffer.from(val, encoding)
            const len = bytes.length
            if (len === 0) {
                throw new TypeError('The value "' + val +
                    '" is invalid for argument "value"')
            }
            for (i = 0; i < end - start; ++i) {
                this[i + start] = bytes[i % len]
            }
        }

        return this
    }
}

export const SlowBuffer = _SlowBuffer
export const INSPECT_MAX_BYTES = 50
export const K_MAX_LENGTH = 0x7fffffff
if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' && typeof console.error === 'function') {
    console.error(
        'This browser lacks typed array (Uint8Array) support which is required by ' +
        '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
    )
}

function checkInt(buf, value, offset, ext, max, min) {
    if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
    if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
}



function hexWrite(buf, string, offset, length) {
    offset = Number(offset) || 0
    const remaining = buf.length - offset
    if (!length) {
        length = remaining
    } else {
        length = Number(length)
        if (length > remaining) {
            length = remaining
        }
    }

    const strLen = string.length

    if (length > strLen / 2) {
        length = strLen / 2
    }
    let i
    for (i = 0; i < length; ++i) {
        const parsed = parseInt(string.substr(i * 2, 2), 16)
        if (numberIsNaN(parsed)) return i
        buf[offset + i] = parsed
    }
    return i
}

function utf8Write(buf, string, offset, length) {
    return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite(buf, string, offset, length) {
    return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function base64Write(buf, string, offset, length) {
    return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write(buf, string, offset, length) {
    return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

function base64Slice(buf, start, end) {
    if (start === 0 && end === buf.length) {
        return base64.fromByteArray(buf)
    } else {
        return base64.fromByteArray(buf.slice(start, end))
    }
}

function utf8Slice(buf, start, end) {
    end = Math.min(buf.length, end)
    const res = []

    let i = start
    while (i < end) {
        const firstByte = buf[i]
        let codePoint = null
        let bytesPerSequence = (firstByte > 0xEF)
            ? 4
            : (firstByte > 0xDF)
                ? 3
                : (firstByte > 0xBF)
                    ? 2
                    : 1

        if (i + bytesPerSequence <= end) {
            let secondByte, thirdByte, fourthByte, tempCodePoint

            switch (bytesPerSequence) {
                case 1:
                    if (firstByte < 0x80) {
                        codePoint = firstByte
                    }
                    break
                case 2:
                    secondByte = buf[i + 1]
                    if ((secondByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
                        if (tempCodePoint > 0x7F) {
                            codePoint = tempCodePoint
                        }
                    }
                    break
                case 3:
                    secondByte = buf[i + 1]
                    thirdByte = buf[i + 2]
                    if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
                        if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
                            codePoint = tempCodePoint
                        }
                    }
                    break
                case 4:
                    secondByte = buf[i + 1]
                    thirdByte = buf[i + 2]
                    fourthByte = buf[i + 3]
                    if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
                        tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
                        if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
                            codePoint = tempCodePoint
                        }
                    }
            }
        }

        if (codePoint === null) {
            // we did not generate a valid codePoint so insert a
            // replacement char (U+FFFD) and advance only 1 byte
            codePoint = 0xFFFD
            bytesPerSequence = 1
        } else if (codePoint > 0xFFFF) {
            // encode to utf16 (surrogate pair dance)
            codePoint -= 0x10000
            res.push(codePoint >>> 10 & 0x3FF | 0xD800)
            codePoint = 0xDC00 | codePoint & 0x3FF
        }

        res.push(codePoint)
        i += bytesPerSequence
    }

    return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
const MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray(codePoints) {
    const len = codePoints.length
    if (len <= MAX_ARGUMENTS_LENGTH) {
        return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
    }

    // Decode in chunks to avoid "call stack size exceeded".
    let res = ''
    let i = 0
    while (i < len) {
        res += String.fromCharCode.apply(
            String,
            codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
        )
    }
    return res
}

function asciiSlice(buf, start, end) {
    let ret = ''
    end = Math.min(buf.length, end)

    for (let i = start; i < end; ++i) {
        ret += String.fromCharCode(buf[i] & 0x7F)
    }
    return ret
}

function latin1Slice(buf, start, end) {
    let ret = ''
    end = Math.min(buf.length, end)

    for (let i = start; i < end; ++i) {
        ret += String.fromCharCode(buf[i])
    }
    return ret
}

function hexSlice(buf, start, end) {
    const len = buf.length

    if (!start || start < 0) start = 0
    if (!end || end < 0 || end > len) end = len

    let out = ''
    for (let i = start; i < end; ++i) {
        out += hexSliceLookupTable[buf[i]]
    }
    return out
}

function utf16leSlice(buf, start, end) {
    const bytes = buf.slice(start, end)
    let res = ''
    // If bytes.length is odd, the last 8 bits must be ignored (same as node.js)
    for (let i = 0; i < bytes.length - 1; i += 2) {
        res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
    }
    return res
}

function wrtBigUInt64LE(buf, value, offset, min, max) {
    checkIntBI(value, min, max, buf, offset, 7)


    let lo = Number(value & BigInt(0xffffffff))
    buf[offset++] = lo
    lo = lo >> 8
    buf[offset++] = lo
    lo = lo >> 8
    buf[offset++] = lo
    lo = lo >> 8
    buf[offset++] = lo

    let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
    buf[offset++] = hi
    hi = hi >> 8
    buf[offset++] = hi
    hi = hi >> 8
    buf[offset++] = hi
    hi = hi >> 8
    buf[offset++] = hi
    return offset
}

function wrtBigUInt64BE(buf, value, offset, min, max) {
    checkIntBI(value, min, max, buf, offset, 7)

    let lo = Number(value & BigInt(0xffffffff))
    buf[offset + 7] = lo
    lo = lo >> 8
    buf[offset + 6] = lo
    lo = lo >> 8
    buf[offset + 5] = lo
    lo = lo >> 8
    buf[offset + 4] = lo

    let hi = Number(value >> BigInt(32) & BigInt(0xffffffff))
    buf[offset + 3] = hi
    hi = hi >> 8
    buf[offset + 2] = hi
    hi = hi >> 8
    buf[offset + 1] = hi
    hi = hi >> 8
    buf[offset] = hi
    return offset + 8
}


function checkIEEE754(buf, value, offset, ext, max, min) {
    if (offset + ext > buf.length) throw new RangeError('Index out of range')
    if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat(buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
    }
    ieee754.write(buf, value, offset, littleEndian, 23, 4)
    return offset + 4
}

function writeDouble(buf, value, offset, littleEndian, noAssert) {
    value = +value
    offset = offset >>> 0
    if (!noAssert) {
        checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
    }
    ieee754.write(buf, value, offset, littleEndian, 52, 8)
    return offset + 8
}
// CUSTOM ERRORS
// =============

// Simplified versions from Node, changed for Buffer-only usage
const errors: any = {}
function E(sym, getMessage, Base) {
    errors[sym] = class NodeError extends Base {
        constructor() {
            super()

            Object.defineProperty(this, 'message', {
                value: getMessage.apply(this, arguments),
                writable: true,
                configurable: true
            })

            // Add the error code to the name to include it in the stack trace.
            this.name = `${this.name} [${sym}]`
            // Access the stack to generate the error message including the error code
            // from the name.
            this.stack // eslint-disable-line no-unused-expressions
            // Reset the name to the actual name.
            delete this.name
        }

        get code() {
            return sym
        }

        set code(value) {
            Object.defineProperty(this, 'code', {
                configurable: true,
                enumerable: true,
                value,
                writable: true
            })
        }

        toString() {
            return `${this.name} [${sym}]: ${this.message}`
        }
    }
}

E('ERR_BUFFER_OUT_OF_BOUNDS',
    function (name) {
        if (name) {
            return `${name} is outside of buffer bounds`
        }

        return 'Attempt to access memory outside buffer bounds'
    }, RangeError)
E('ERR_INVALID_ARG_TYPE',
    function (name, actual) {
        return `The "${name}" argument must be of type number. Received type ${typeof actual}`
    }, TypeError)
E('ERR_OUT_OF_RANGE',
    function (str, range, input) {
        let msg = `The value of "${str}" is out of range.`
        let received = input

        if (Number.isInteger(input) && Math.abs(input) > 2 ** 32) {
            received = addNumericalSeparator(String(input))
        } else if (typeof input === 'bigint') {
            received = String(input)

            if (input > BigInt(2) ** BigInt(32) || input < -(BigInt(2) ** BigInt(32))) {
                received = addNumericalSeparator(received)
            }
            received += 'n'
        }
        msg += ` It must be ${range}. Received ${received}`
        return msg
    }, RangeError)

function addNumericalSeparator(val) {
    let res = ''
    let i = val.length
    const start = val[0] === '-' ? 1 : 0
    for (; i >= start + 4; i -= 3) {
        res = `_${val.slice(i - 3, i)}${res}`
    }
    return `${val.slice(0, i)}${res}`
}

// CHECK FUNCTIONS
// ===============

function checkBounds(buf, offset, byteLength) {
    validateNumber(offset, 'offset')
    if (buf[offset] === undefined || buf[offset + byteLength] === undefined) {
        boundsError(offset, buf.length - (byteLength + 1))
    }
}

function checkIntBI(value, min, max, buf, offset, byteLength) {
    if (value > max || value < min) {
        const n = typeof min === 'bigint' ? 'n' : ''
        let range
        if (byteLength > 3) {

            if (min === 0 || min === BigInt(0)) {
                range = `>= 0${n} and < 2${n} ** ${(byteLength + 1) * 8}${n}`
            } else {
                range = `>= -(2${n} ** ${(byteLength + 1) * 8 - 1}${n}) and < 2 ** ` +
                    `${(byteLength + 1) * 8 - 1}${n}`
            }
        } else {
            range = `>= ${min}${n} and <= ${max}${n}`
        }
        throw new errors.ERR_OUT_OF_RANGE('value', range, value)
    }
    checkBounds(buf, offset, byteLength)
}

function validateNumber(value, name) {
    if (typeof value !== 'number') {
        throw new errors.ERR_INVALID_ARG_TYPE(name, 'number', value)
    }
}

function boundsError(value, length, type?) {
    if (Math.floor(value) !== value) {
        validateNumber(value, type)
        throw new errors.ERR_OUT_OF_RANGE(type || 'offset', 'an integer', value)
    }

    if (length < 0) {
        throw new errors.ERR_BUFFER_OUT_OF_BOUNDS()
    }

    throw new errors.ERR_OUT_OF_RANGE(type || 'offset',
        `>= ${type ? 1 : 0} and <= ${length}`,
        value)
}
// HELPER FUNCTIONS
// ================

const INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean(str) {
    // Node takes equal signs as end of the Base64 encoding
    str = str.split('=')[0]
    // Node strips out invalid characters like \n and \t from the string, base64-js does not
    str = str.trim().replace(INVALID_BASE64_RE, '')
    // Node converts strings with length < 2 to ''
    if (str.length < 2) return ''
    // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
    while (str.length % 4 !== 0) {
        str = str + '='
    }
    return str
}


function utf8ToBytes(string, units?) {
    units = units || Infinity
    let codePoint
    const length = string.length
    let leadSurrogate = null
    const bytes = []

    for (let i = 0; i < length; ++i) {
        codePoint = string.charCodeAt(i)

        // is surrogate component
        if (codePoint > 0xD7FF && codePoint < 0xE000) {
            // last char was a lead
            if (!leadSurrogate) {
                // no lead yet
                if (codePoint > 0xDBFF) {
                    // unexpected trail
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    continue
                } else if (i + 1 === length) {
                    // unpaired lead
                    if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                    continue
                }

                // valid lead
                leadSurrogate = codePoint

                continue
            }

            // 2 leads in a row
            if (codePoint < 0xDC00) {
                if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
                leadSurrogate = codePoint
                continue
            }

            // valid surrogate pair
            codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
        } else if (leadSurrogate) {
            // valid bmp char, but last char was a lead
            if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        }

        leadSurrogate = null

        // encode utf8
        if (codePoint < 0x80) {
            if ((units -= 1) < 0) break
            bytes.push(codePoint)
        } else if (codePoint < 0x800) {
            if ((units -= 2) < 0) break
            bytes.push(
                codePoint >> 0x6 | 0xC0,
                codePoint & 0x3F | 0x80
            )
        } else if (codePoint < 0x10000) {
            if ((units -= 3) < 0) break
            bytes.push(
                codePoint >> 0xC | 0xE0,
                codePoint >> 0x6 & 0x3F | 0x80,
                codePoint & 0x3F | 0x80
            )
        } else if (codePoint < 0x110000) {
            if ((units -= 4) < 0) break
            bytes.push(
                codePoint >> 0x12 | 0xF0,
                codePoint >> 0xC & 0x3F | 0x80,
                codePoint >> 0x6 & 0x3F | 0x80,
                codePoint & 0x3F | 0x80
            )
        } else {
            throw new Error('Invalid code point')
        }
    }

    return bytes
}

function asciiToBytes(str) {
    const byteArray = []
    for (let i = 0; i < str.length; ++i) {
        // Node's code seems to be doing this and not & 0x7F..
        byteArray.push(str.charCodeAt(i) & 0xFF)
    }
    return byteArray
}

function utf16leToBytes(str, units) {
    let c, hi, lo
    const byteArray = []
    for (let i = 0; i < str.length; ++i) {
        if ((units -= 2) < 0) break

        c = str.charCodeAt(i)
        hi = c >> 8
        lo = c % 256
        byteArray.push(lo)
        byteArray.push(hi)
    }

    return byteArray
}

function base64ToBytes(str) {
    return base64.toByteArray(base64clean(str))
}

function blitBuffer(src, dst, offset, length) {
    let i
    for (i = 0; i < length; ++i) {
        if ((i + offset >= dst.length) || (i >= src.length)) break
        dst[i + offset] = src[i]
    }
    return i
}

// ArrayBuffer or Uint8Array objects from other contexts (i.e. iframes) do not pass
// the `instanceof` check but they should be treated as of that type.
// See: https://github.com/feross/buffer/issues/166
function isInstance(obj, type) {
    return obj instanceof type ||
        (obj != null && obj.constructor != null && obj.constructor.name != null &&
            obj.constructor.name === type.name)
}

function numberIsNaN(obj) {
    // For IE11 support
    return obj !== obj // eslint-disable-line no-self-compare
}

// Create lookup table for `toString('hex')`
// See: https://github.com/feross/buffer/issues/219
const hexSliceLookupTable = (function () {
    const alphabet = '0123456789abcdef'
    const table = new Array(256)
    for (let i = 0; i < 16; ++i) {
        const i16 = i * 16
        for (let j = 0; j < 16; ++j) {
            table[i16 + j] = alphabet[i] + alphabet[j]
        }
    }
    return table
})()

// Return not function with Error if BigInt not supported
function defineBigIntMethod() {

    let check = typeof BigInt === 'undefined'
    if (check) { BufferBigIntNotDefined() }
    return check
}

function BufferBigIntNotDefined() {
    throw new Error('BigInt not supported')
}


function slowToString(encoding, start, end) {
    let loweredCase = false

    // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
    // property of a typed array.

    // This behaves neither like String nor Uint8Array in that we set start/end
    // to their upper/lower bounds if the value passed is out of range.
    // undefined is handled specially as per ECMA-262 6th Edition,
    // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
    if (start === undefined || start < 0) {
        start = 0
    }
    // Return early if start > this.length. Done here to prevent potential uint32
    // coercion fail below.
    if (start > this.length) {
        return ''
    }

    if (end === undefined || end > this.length) {
        end = this.length
    }

    if (end <= 0) {
        return ''
    }

    // Force coercion to uint32. This will also coerce falsey/NaN values to 0.
    end >>>= 0
    start >>>= 0

    if (end <= start) {
        return ''
    }

    if (!encoding) encoding = 'utf8'

    while (true) {
        switch (encoding) {
            case 'hex':
                return hexSlice(this, start, end)

            case 'utf8':
            case 'utf-8':
                return utf8Slice(this, start, end)

            case 'ascii':
                return asciiSlice(this, start, end)

            case 'latin1':
            case 'binary':
                return latin1Slice(this, start, end)

            case 'base64':
                return base64Slice(this, start, end)

            case 'ucs2':
            case 'ucs-2':
            case 'utf16le':
            case 'utf-16le':
                return utf16leSlice(this, start, end)

            default:
                if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
                encoding = (encoding + '').toLowerCase()
                loweredCase = true
        }
    }
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
    // Empty buffer means no match
    if (buffer.length === 0) return -1

    // Normalize byteOffset
    if (typeof byteOffset === 'string') {
        encoding = byteOffset
        byteOffset = 0
    } else if (byteOffset > 0x7fffffff) {
        byteOffset = 0x7fffffff
    } else if (byteOffset < -0x80000000) {
        byteOffset = -0x80000000
    }
    byteOffset = +byteOffset // Coerce to Number.
    if (numberIsNaN(byteOffset)) {
        // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
        byteOffset = dir ? 0 : (buffer.length - 1)
    }

    // Normalize byteOffset: negative offsets start from the end of the buffer
    if (byteOffset < 0) byteOffset = buffer.length + byteOffset
    if (byteOffset >= buffer.length) {
        if (dir) return -1
        else byteOffset = buffer.length - 1
    } else if (byteOffset < 0) {
        if (dir) byteOffset = 0
        else return -1
    }

    // Normalize val
    if (typeof val === 'string') {
        val = Buffer.from(val, encoding)
    }

    // Finally, search either indexOf (if dir is true) or lastIndexOf
    if (Buffer.isBuffer(val)) {
        // Special case: looking for empty string/buffer always fails
        if (val.length === 0) {
            return -1
        }
        return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
    } else if (typeof val === 'number') {
        val = val & 0xFF // Search for a byte value [0-255]
        if (typeof Uint8Array.prototype.indexOf === 'function') {
            if (dir) {
                return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
            } else {
                return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
            }
        }
        return arrayIndexOf(buffer, [val], byteOffset, encoding, dir)
    }

    throw new TypeError('val must be string, number or Buffer')
}
function checkOffset(offset, ext, length) {
    if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
    if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}
function arrayIndexOf(arr, val, byteOffset, encoding, dir) {
    let indexSize = 1
    let arrLength = arr.length
    let valLength = val.length

    if (encoding !== undefined) {
        encoding = String(encoding).toLowerCase()
        if (encoding === 'ucs2' || encoding === 'ucs-2' ||
            encoding === 'utf16le' || encoding === 'utf-16le') {
            if (arr.length < 2 || val.length < 2) {
                return -1
            }
            indexSize = 2
            arrLength /= 2
            valLength /= 2
            byteOffset /= 2
        }
    }

    function read(buf, i) {
        if (indexSize === 1) {
            return buf[i]
        } else {
            return buf.readUInt16BE(i * indexSize)
        }
    }

    let i
    if (dir) {
        let foundIndex = -1
        for (i = byteOffset; i < arrLength; i++) {
            if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
                if (foundIndex === -1) foundIndex = i
                if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
            } else {
                if (foundIndex !== -1) i -= i - foundIndex
                foundIndex = -1
            }
        }
    } else {
        if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
        for (i = byteOffset; i >= 0; i--) {
            let found = true
            for (let j = 0; j < valLength; j++) {
                if (read(arr, i + j) !== read(val, j)) {
                    found = false
                    break
                }
            }
            if (found) return i
        }
    }

    return -1
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
// Buffer.prototype._isBuffer = true

function swap(b, n, m) {
    const i = b[n]
    b[n] = b[m]
    b[m] = i
}

function from(value, encodingOrOffset, length) {
    if (typeof value === 'string') {
        return fromString(value, encodingOrOffset)
    }

    if (ArrayBuffer.isView(value)) {
        return fromArrayView(value)
    }

    if (value == null) {
        throw new TypeError(
            'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
            'or Array-like Object. Received type ' + (typeof value)
        )
    }

    if (isInstance(value, ArrayBuffer) ||
        (value && isInstance(value.buffer, ArrayBuffer))) {
        return fromArrayBuffer(value, encodingOrOffset, length)
    }

    if (typeof SharedArrayBuffer !== 'undefined' && (isInstance(value, SharedArrayBuffer) || (value && isInstance(value.buffer, SharedArrayBuffer)))) {
        return fromArrayBuffer(value, encodingOrOffset, length)
    }

    if (typeof value === 'number') {
        throw new TypeError(
            'The "value" argument must not be of type number. Received type number'
        )
    }

    const valueOf = value.valueOf && value.valueOf()
    if (valueOf != null && valueOf !== value) {
        return Buffer.from(valueOf, encodingOrOffset, length)
    }

    const b = fromObject(value)
    if (b) return b

    if (typeof Symbol !== 'undefined' && Symbol.toPrimitive != null && typeof value[Symbol.toPrimitive] === 'function') {

        return Buffer.from(value[Symbol.toPrimitive]('string'), encodingOrOffset, length)
    }

    throw new TypeError(
        'The first argument must be one of type string, Buffer, ArrayBuffer, Array, ' +
        'or Array-like Object. Received type ' + (typeof value)
    )
}

Object.defineProperty(Buffer.prototype, 'parent', {
    enumerable: true,
    get: function () {
        if (!Buffer.isBuffer(this)) return undefined
        return this.buffer
    }
})

Object.defineProperty(Buffer.prototype, 'offset', {
    enumerable: true,
    get: function () {
        if (!Buffer.isBuffer(this)) return undefined
        return this.byteOffset
    }
})


// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148

Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype)

Object.setPrototypeOf(Buffer, Uint8Array)

function assertSize(size) {
    if (typeof size !== 'number') {
        throw new TypeError('"size" argument must be of type number')
    } else if (size < 0) {
        throw new RangeError('The value "' + size + '" is invalid for option "size"')
    }
}

function alloc(size, fill, encoding) {
    assertSize(size)
    if (size <= 0) {
        return createBuffer(size)
    }
    if (fill !== undefined) {
        // Only pay attention to encoding if it's a string. This
        // prevents accidentally sending in a number that would
        // be interpreted as a start offset.
        return typeof encoding === 'string'
            ? createBuffer(size).fill(fill, encoding as any)
            : createBuffer(size).fill(fill)
    }
    return createBuffer(size)
}
function allocUnsafe(size) {
    assertSize(size)
    return createBuffer(size < 0 ? 0 : checked(size) | 0)
}


function fromString(string, encoding) {
    if (typeof encoding !== 'string' || encoding === '') {
        encoding = 'utf8'
    }

    if (!Buffer.isEncoding(encoding)) {
        throw new TypeError('Unknown encoding: ' + encoding)
    }

    const length = Buffer.byteLength(string, encoding) | 0
    let buf = createBuffer(length)


    const actual = buf.write(string, encoding)

    if (actual !== length) {
        // Writing a hex string, for example, that contains invalid characters will
        // cause everything after the first invalid character to be ignored. (e.g.
        // 'abxxcd' will be treated as 'ab')
        buf = buf.slice(0, actual)
    }

    return buf
}

function fromArrayLike(array) {
    const length = array.length < 0 ? 0 : checked(array.length) | 0
    const buf = createBuffer(length)
    for (let i = 0; i < length; i += 1) {
        buf[i] = array[i] & 255
    }
    return buf
}

function fromArrayView(arrayView) {
    if (isInstance(arrayView, Uint8Array)) {
        const copy = new Uint8Array(arrayView)
        return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
    }
    return fromArrayLike(arrayView)
}

function fromArrayBuffer(array, byteOffset, length) {
    if (byteOffset < 0 || array.byteLength < byteOffset) {
        throw new RangeError('"offset" is outside of buffer bounds')
    }

    if (array.byteLength < byteOffset + (length || 0)) {
        throw new RangeError('"length" is outside of buffer bounds')
    }

    let buf
    if (byteOffset === undefined && length === undefined) {
        buf = new Uint8Array(array)
    } else if (length === undefined) {
        buf = new Uint8Array(array, byteOffset)
    } else {
        buf = new Uint8Array(array, byteOffset, length)
    }

    // Return an augmented `Uint8Array` instance

    Object.setPrototypeOf(buf, Buffer.prototype)

    return buf
}

function fromObject(obj) {
    if (Buffer.isBuffer(obj)) {
        const len = checked(obj.length) | 0
        const buf = createBuffer(len)

        if (buf.length === 0) {
            return buf
        }

        obj.copy(buf, 0, 0, len)
        return buf
    }

    if (obj.length !== undefined) {
        if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
            return createBuffer(0)
        }
        return fromArrayLike(obj)
    }

    if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
        return fromArrayLike(obj.data)
    }
}

function createBuffer(length) {
    if (length > K_MAX_LENGTH) {
        throw new RangeError('The value "' + length + '" is invalid for option "size"')
    }
    // Return an augmented `Uint8Array` instance
    const buf = new Uint8Array(length)

    Object.setPrototypeOf(buf, Buffer.prototype)
    return buf
}

function checked(length) {
    // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
    // length is NaN (which is otherwise coerced to zero.)
    if (length >= K_MAX_LENGTH) {
        throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
            'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
    }
    return length | 0
}

function _SlowBuffer(length) {
    if (+length != length) { // eslint-disable-line eqeqeq
        length = 0
    }

    return Buffer.alloc(+length)
}


/*
* Need to make sure that buffer isn't trying to write out of bounds.
*/









if (customInspectSymbol) {
    Buffer.prototype[customInspectSymbol] = Buffer.prototype.inspect
}